The influence of lowered gravitation on biomass and CO2 production in B. megaterium, a xerophyte, and Spirillum azotocolligens, an aqueous spirillum, in liquid nutrient medium on a horizontal clinostat at 0.1 g has been studied. As controls we considered: 1) growth under stationary conditions of cultivation with test tubes oriented horizontally; 2) growth on a synchronously revolving centrifuge; and 3) growth on a swing with stirring. A horizontal clinostat at 0.1 g stimulates biomass production and CO2 release in B. megaterium as compared with the controls. Spirillum azotocolligens growth is reduced as a result of clinostating. The best development and CO2 production are observed under stationary conditions. The results do not support the assumption that microorganisms living in water are more resistant to lowered gravitation than those living in soil.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/0273-1177(81)90259-3 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Multi-objective optimization of hybrid energy systems using gravitational search algorithm.
Sci Rep
January 2025
Department of Energy Engineering & Physics, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.
The depletion of fossil fuel reserves, increasing environmental concerns, and energy demands of remote communities have increased the acceptance of using hybrid renewable energy systems (HRES). However, choosing an optimal HRES from economic, environmental, reliability, and sustainability aspects is still challenging. To solve this challenge, this study introduces a novel multi-objective optimization approach using the Gravitational Search Algorithm (GSA) and non-dominated sorting techniques.
View Article and Find Full Text PDFTarget interception in virtual reality is better for natural versus unnatural trajectory shapes and orientations.
J Vis
January 2025
Neuroscience Program, University of Western Ontario, London, Ontario, Canada.
Human performance in perceptual and visuomotor tasks is enhanced when stimulus motion follows the laws of gravitational physics, including acceleration consistent with Earth's gravity, g. Here we used a manual interception task in virtual reality to investigate the effects of trajectory shape and orientation on interception timing and accuracy. Participants punched to intercept a ball moving along one of four trajectories that varied in shape (parabola or tent) and orientation (upright or inverted).
View Article and Find Full Text PDF[Effect of extra corporeal reducing pre-load on pulmonary mechanical power in patients with acute respiratory distress syndrome].
Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
December 2024
Department of Public Utilities Development, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, Zhengzhou 450003, Henan, China.
Objective: To explore the effects of veno-venous extra corporeal carbon dioxide removal (V-V ECCOR) on local mechanical power and gas distribution in the lungs of patients with mild to moderate acute respiratory distress syndrome (ARDS) receiving non-invasive ventilation.
Methods: Retrospective research methods were conducted. Sixty patients with mild to moderate ARDS complicated with renal insufficiency who were transferred to the respiratory intensive care unit (RICU) through the 96195 platform critical care transport green channel from January 2018 to January 2020 at the collaborative hospitals of Henan Provincial People's Hospital were enrolled.
Forearm elevation impairs local static handgrip endurance likely through reduction in vascular conductance and perfusion pressure: revisiting Rohmert's curve.
Sci Rep
January 2025
Institute for Anatomy und Cell Biology, Department of Medical Cell Biology, Philipps-Universität Marburg, Robert-Koch-Str. 8, 35032, Marburg, Germany.
Maximal isometric contraction time (MICT) is critical for most motor tasks and depends on skeletal muscle blood flow at < 40% of maximal voluntary strength (MVC). Whether limb work positions associated with reduced perfusion pressure and facilitated vessel compression affect MICT is largely unknown. In 14 healthy young men we therefore assessed bilateral handgrip MICT at 15, 20, 30, 40, and 70% of MVC in horizontal forearm positions of 0.
View Article and Find Full Text PDFThe effect of gravity on hand spatio-temporal kinematic features during functional movements.
PLoS One
December 2024
Rehab Technologies Lab, Istituto Italiano di Tecnologia, Genoa, Italy.
Understanding the impact of gravity on daily upper-limb movements is crucial for comprehending upper-limb impairments. This study investigates the relationship between gravitational force and upper-limb mobility by analyzing hand trajectories from 24 healthy subjects performing nine pick-and-place tasks, captured using a motion capture system. The results reveal significant differences in motor behavior in terms of planning, smoothness, efficiency, and accuracy when movements are performed against or with gravity.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!